Method for controlling driving of drum-type washing machine and apparatus thereof

Abstract

Disclosed are a method for controlling a driving of a drum type washing machine preventing vibration and noise of a drum, reducing a usage of washing water, and reducing rinse time, and an apparatus thereof. To this end, the drum is rotated with a preset equilibrium speed faster than a speed that vibration of the drum is excessively generated accordingly as a rotation speed of the drum is decreased when a dewatering process of laundry is completed, and washing water is supplied into the drum type washing machine while maintaining the drum as the preset equilibrium speed.

1. A method for controlling a driving of a drum type washing machine, comprising:
 dewatering laundry in a drum by rotating the drum with a first preset speed; 
 decreasing a speed of the drum to a second preset speed when the dewatering step is completed, the second preset speed being lower than the first preset speed and higher than a speed at which vibration of the drum is excessively generated; 
 rotating the drum while maintaining the second preset speed; and 
 supplying washing water into the drum type washing machine during the rotating step. 
 
   
   
     2. The method of  claim 1 , wherein the second preset speed is 200˜500 rpm. 
   
   
     3. The method of  claim 1 , further comprising performing a rinse process while maintaining a rotation speed of the drum at the second preset speed. 
   
   
     4. A method for controlling a driving of a drum type washing machine, comprising the steps of:
 dewatering laundry in a drum by rotating the drum with a first preset speed; 
 decreasing a speed of the drum to a preset equilibrium speed when the dewatering step is completed after a washing process or when the dewatering step is completed after a rinse process, the preset equilibrium speed being lower than the first preset speed and higher than a speed at which vibration of the drum is excessively generated; 
 rotating the drum while maintaining the preset equilibrium speed; and 
 supplying washing water for performing the rinse process into a tub of the drum type washing machine during the rotating step. 
 
   
   
     5. The method of  claim 4 , further comprising draining washing water inside the tub while rotating the drum as the preset equilibrium speed. 
   
   
     6. The method of  claim 5 , further comprising desiccating by increasing the preset equilibrium speed of the drum when the draining step is completed. 
   
   
     7. The method of  claim 4 , further comprising:
 detecting a first eccentric amount of the drum at a first speed faster than a rotation speed of the drum at the time of the washing process after the washing process is completed; 
 detecting a second eccentric amount of the drum at a second speed faster than the rotation speed of the drum at the time of the washing process and slower than the rotation speed of the drum at the time of the dewatering step; and 
 performing the dewatering step when the detected first and second eccentric amounts are less than a preset reference value. 
 
   
   
     8. The method of  claim 7 , wherein the second eccentric amount is detected at the second speed when the eccentric amount detected at the first speed is less than the preset reference value, and a driving of the drum is stopped when the eccentric amount detected at the first speed exceeds the preset reference value and then the drum is again driven thus to detect the first eccentric amount at the first speed, which is repeatedly performed. 
   
   
     9. The method of  claim 8 , further comprising:
 repeatedly performing the rinse step, the drain step, and the dewatering process while maintaining the preset equilibrium speed when the detected second eccentric amount is less than the preset reference value; and 
 stopping a driving of the drum, supplying washing water into the tub, and thereby performing the rinse process when the second eccentric amount detected at the second speed exceeds the preset reference value.